Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Evidence for an active process and a cochlear amplifier in nonmammals
Autore:
Manley, GA;
Indirizzi:
Tech Univ Munich, Lehrstuhl Zool, D-85747 Garching, Germany Tech Univ Munich Garching Germany D-85747 ool, D-85747 Garching, Germany
Titolo Testata:
JOURNAL OF NEUROPHYSIOLOGY
fascicolo: 2, volume: 86, anno: 2001,
pagine: 541 - 549
SICI:
0022-3077(200108)86:2<541:EFAAPA>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
OUTER HAIR-CELLS; SPONTANEOUS OTOACOUSTIC EMISSIONS; RATE-INTENSITY FUNCTIONS; BASILAR-MEMBRANE NONLINEARITY; AUDITORY-NERVE FIBERS; BUNDLE MOVEMENTS; BOBTAIL LIZARD; GUINEA-PIG; TRANSDUCTION; ADAPTATION;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
63
Recensione:
Indirizzi per estratti:
Indirizzo: Manley, GA Tech Univ Munich, Lehrstuhl Zool, Lichtenbergstr 4, D-85747 Garching, Germany Tech Univ Munich Lichtenbergstr 4 Garching Germany D-85747 any
Citazione:
G.A. Manley, "Evidence for an active process and a cochlear amplifier in nonmammals", J NEUROPHYS, 86(2), 2001, pp. 541-549

Abstract

The last two decades have produced a great deal of evidence that in the mammalian organ of Corti outer hair cells undergo active shape changes that are part of a "cochlear amplifier" mechanism that increases sensitivity and frequency selectivity of the hearing epithelium. However, many signs of active processes have also been found in nonmammals, raising the question as to the ancestry and commonality of these mechanisms. Active movements would be advantageous in all kinds of sensory hair cells because they help signaldetection at levels near those of thermal noise and also help to overcome fluid viscosity. Such active mechanisms therefore presumably arose in the earliest kinds of hair cells that were part of the lateral line system of fish. These cells were embedded in a firm epithelium and responded to relative motion between the hair bundle and the hair cell, making it highly likelythat the first active motor mechanism was localized in the hair-cell bundle. In terrestrial nonmammals, there are many auditory phenomena that are best explained by the presence of a cochlear amplifier, indicating that in this respect the mammalian ear is not unique. The latest evidence supports siting the active process in nonmammals in the hair-cell bundle and in intimate association with the transduction process.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 16:00:53